英文關鍵字
ancient
and
architecture
beautiful
blue
boat
bridge
building
center
city
cityscape
culture
day
dom
douro
down
downtown
embankment
europe
hill
historic
historical
history
horizontal
house
landmark
luis
old
oporto
panorama
panoramic
port
porto
portugal
portuguese
red
ribeira
river
sky
sunset
tourism
town
traditional
tram
travel
unesco
urban
view
water
white
wine
yellow